[libvirt] What is the strategy to update the CPU Models in src/cpu/cpu_map.xml based on?

Hi All, I am not sure about the update strategy of CPU models in libvirt. IMO, It's depend on the CPU model in qemu-kvm, if some CPU models were updated in qemu-kvm. Then, we should modify the src/cpu/cpu_map.xml of libvirt to synchronize? eg: commit cad8054ece28("cpu: Add cpu definition for Intel Sandy Bridge cpu type") in libvirt upstream. https://bugzilla.redhat.com/show_bug.cgi?id=761005 If it's right, I found this commit b3a4f0b1a072("target-i386: add VME to all CPUs") updated the VME feature in qemu upstream. But in the src/cpu /cpu_map.xml of libvirt, It didn't be updated. eg: For the SandyBridge CPU, - In QEmu, it has the 'vme' feature defined by CPUID_VME - In libvirt, it doesn't has the 'vme' in cpu_map.xml file. Why? Thanks, dou